Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 90-91).

A quantitative analytical method, using column chromatography, was developed for determining the thujaplicin methyl ethers (T.M.E.) in acetone extracts of western red cedar wood. A quantitative method, using gas-liquid chromatography, was developed for nezukone, while thujaplicins were determined by paper chromatography. These techniques were used to examine distribution of T.M.E. and thujaplicins across western red cedar stems. Results support the theory that polyphenols are formed in situ at the sapwood-heartwood boundary. The findings also indicate that biochemical mechanisms operate for several years after visible heartwood has been formed. Additionally, the increase in ratios of monohydroxy- and dihydroxy- to nonhydroxylated T.M.E. with wood ageing in the tree suggests a hydroxylation reaction as mechanism for interconversion of some of the lignans in western red cedar. However, this conclusion cannot be made for the hydroxylation of nezukone to β-thujaplicin to β-thujaplicinol. The thujaplicins were shown to be present only in the heartwood of western red cedar. α-Thujaplicin was not found in the present study, but it was certainly present in a previous study on an American grown western red cedar. Some characteristic chemical properties of β-thujaplicinol, which has an additional hydroxyl group to the thujaplicins, are studied. Its ferric chelate was found to be unstable to change in pH values of solutions, while thujaplicins complexes are stable. Some observations on the determination of thujaplicin in alkaline solutions, as well as methods for extracting these compounds, are made. / Forestry, Faculty of / Graduate

Penetrability of a single western red cedar (Thuja plicata Donn) stem was investigated using three types of preservatives, namely, coal-tar creosote, 5% penta-chlorophenol solution in oil and 2% Wolman salt (type A) solution in water. The retentions of all three preservatives in the sapwood zone exceeded those in the heartwood. The inner, darker heartwood was superior in penetrability, retaining on the average two to three times more preservatives than did the outer, straw-coloured heartwood. A multiple linear regression technique was used to evaluate the importance of independent variables as they affected the penetrability of the western red cedar heartwood. The following independent variables were considered: age, distance from the pith, growth rate, percentage of latewood, specific gravity, colour, hot-water solubility, and effective one per cent caustic soda solubility (hot-water solubility subtracted from 1% NaOH solubility) of the samples. The colour variable for creosote and pentachlorophenol, and the age variable for Wolman salt were the most important variables. Colour was measured using a Model "F" Agtron electronic colour instrument which expressed the colour numerically on a continuous scale. No thujaplicins - natural preservatives - were found in the pith region of the heartwood, nor in the sap-wood. Around the 50-year age mark thujaplicins began to appear, and their content increased towards the bark, reaching a maximum of 0.835 per cent in the zone next to the sapwood. A fungal infection, believed to be caused by one of the Fungi Imperfect of the white rot type, was found spreading from the pith region outward in the heartwood. In the region where thujaplicin concentration reached 0.361 to 0.549 per cent the fungal infection was not found. / Forestry, Faculty of / Graduate

Thesis (Ph. D.)--Washington University, 1899. / Cover title. "Printed in advance from the eleventh Annual report of the Missouri Botanical Garden."

Thesis (Ph. D.)--Washington University, 1899. / Cover title. "Printed in advance from the eleventh Annual report of the Missouri Botanical Garden."

Samples of sapwood and bark of western redcedar were collected at 3 day to 6 week intervals after injury and extracted with water, chloroform and acetone. Extracts were tested for the presence of some common heart-wood compounds and in vitro fungi toxic properties. Extracted samples collected 6 weeks after injury were inoculated with a decay fungus, and the resulting weight losses determined. No heartwood compounds were detected in any extracts, and no extracts were fungi toxic in vitro. Weight losses following decay of extracted chips indicated that decay resistance was initiated in the bark and sapwood. Thus, these tissues possess a mechanism of disease resistance induced by injury. It is concluded that this resistance results from the deposition of a toxic substance that is unextractable with water, chloroform, or acetone. The alteration of sapwood, if not the bark, is analogous in certain respects to the formation of reaction zones in the sapwood of various trees, since these zones are induced by injury and are characterized by abnormal toxin formation. However, the toxins formed in other trees are normal heartwood constituents, and in this respect apparently not parallel to the toxic substance induced in western redcedar. / Forestry, Faculty of / Graduate

Thesis (M.A.)--Brigham Young University. Dept. of History. / Includes bibliographical references (leaves 165-171).

Thesis (M.A.)--Brigham Young University. Dept. of History. / Electronic thesis. Includes bibliographical references (leaves 165-171). Also available in print ed.

Thesis (M.Ed.)--Kutztown State College, 1963. / Source: Masters Abstracts International, Volume: 45-06, page: 2752. Typescript. Includes bibliographical references (leaves [83]-85)

M.S.